<template>
    <div class="goodsinfo-container">
        <!-- 小球 -->
        <transition
            @before-enter="beforeEnter"
            @enter="enter"
            @after-enter="afterEnter">
            <div class="ball" v-show="ballFlag" ref="ball"></div>
        </transition>

        <!-- 商品轮播图区域 -->
        <div class="mui-card-content">
            <div class="mui-card-content-inner">
                <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
            </div>
        </div>

        <!-- 商品购买区域 -->
        <div class="mui-card">
            <div class="mui-card-header">{{ goodsinfo.title }}</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p class="price">
                        市场价: <del>￥{{ goodsinfo.market_price }}</del>
                        &nbsp;
                        &nbsp;
                        销售价:
                        <span class="now_price">
                            ￥{{ goodsinfo.sell_price }}
                        </span>
                    </p>
                    <p>
                        购买数量:
                        <numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>
                    </p>
                    <p>
                        <mt-button type="primary" size="small">立即购买</mt-button>
                        <mt-button type="danger" size="small" @click="addShopCart">加入购物车</mt-button>
                        <!-- 实现加入购物车到时候获取选择的数量 -->
                    </p>
                </div>
            </div>
        </div>

        <!-- 商品参数区域 -->
        <div class="mui-card">
            <div class="mui-card-header">商品参数</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p>
                        商品货号：{{ goodsinfo.goods_no }}
                    </p>
                    <p>
                        库存情况：{{ goodsinfo.stock_quantity }}件
                    </p>
                    <p>
                        上架时间：{{ goodsinfo.add_time | dateFormat }}
                    </p>
                </div>
            </div>
            <div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
            </div>
        </div>
    </div>
</template>
<script>
    // 导入轮播图组件
    import swiper from '../subcomponents/Swipe.vue';
    // 导入 数字选择框 组件
    import numbox from "../subcomponents/goodsinfo_numbox.vue";
    export default {
        data(){
            return {
                // 路由参数的id
                id: this.$route.params.id,
                // 轮播图的数据
                lunbotu: [],
                // 获取到的商品的信息
                goodsinfo: {},
                // 小球显示隐藏的属性    
                ballFlag: false,
                // 默认选择的数量
                selectedCount: 1,
            }
        },
        created() {
            this.getLunboTu();
            this.getGoodsInfo();
        },
        methods: {
            
            getLunboTu(){
                this.$http.get('api/getthumimages/' + this.id).then(result => {
                    if(result.body.status == 0){
                        // 循环每一项添加img属性
                        result.body.message.forEach(item => {
                            item.img = item.src;
                        });
                        this.lunbotu = result.body.message;
                    }
                });
            },
            getGoodsInfo(){
                this.$http.get('api/goods/getinfo/' + this.id).then( result => {
                    if(result.body.status == 0){
                        this.goodsinfo = result.body.message;
                    }
                });
            },
            goDesc(id){
                // 点击跳转到图文介绍
                this.$router.push({
                    name: 'goodsdesc',
                    params: { id }
                });
            },
            getComment(id){
                this.$router.push({
                    name: 'goodscomment',
                    params: { id }
                });
            },
            // 添加到购物车
            addShopCart(){
                this.ballFlag = true;

                // 拼接保存到store的car中的数据
                var goodInfo = {
                    id: this.id,
                    count: this.selectedCount,
                    price: this.goodsinfo.sell_price,
                    selected: true,
                }
                //调用方法保存数据
                this.$store.commit("addToCar", goodInfo);
            },
            beforeEnter(el){
                el.style.transform = "translate(0,0)";
            },
            enter(el, done){
                el.offsetWith;
                // 小球动画优化思路
                // 先分析导致不准确的原因
                // 小球如果位移的位置写死，那么就会出现问题
                const ballPosition = this.$refs.ball.getBoundingClientRect();
                const badgePosition = document.getElementById("badge").getBoundingClientRect();
                const xDist = badgePosition.left - ballPosition.left;
                const yDist = badgePosition.top - ballPosition.top;

                el.style.transform = `translate(${xDist}px, ${yDist}px)`;
                el.style.transition = "all 0.5s cublic-bezier(.4, -.3,1,.68)";
                done();
            },
            afterEnter(el){
                this.ballFlag = !this.ballFlag;
            },
            getSelectedCount(count){
                this.selectedCount = count;
                // console.log('父组件那到的值是:'+this.selectedCount);
            }
        },
        components: {
            swiper,
            numbox
        }
    }
</script>
<style lang="scss" scoped>
    .goodsinfo-container{
        background-color: #eee;
        overflow: hidden;

        .now_price{
            color: red;
            font-size: 16px;
            font-weight: bold;
        }

        .mui-card-footer{
            display: block;
            button{
                margin: 15px 0;
            }
        }
        .ball{
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: red;
            position: absolute;
            top: 390px;
            left: 146px;
            z-index: 99;
        }
    }
</style>